Is HPL a brand or a type of 15w40? What about a synthetic? Would that change anything? I've never had this issue so I'm really stumped as to why it's happening.You can. It will you definitively this much fuel is there. If there isn’t that much…you may need an oil with stronger base stocks, for example HPL 15w40 which use PAO for base stock, and is very shear stable.
Is this the correct Polaris?HPL is high performance lubricants. It is a synthetic extended drain oil that is very stout
Here is a link. It’s pricey but extremely high quality products.
High Performance Lubricants Premium Heavy Duty CK-4 engine oil is one of 3 multi-synthetic engine oils we offer. Compared to our Heavy Duty CK-4 this group of formulations take advantage of an advanced VI improver that has a superior shear stability index. It is designed for equipment or...www.advlubrication.com
Elemental composition is second page of this thread
GC is gas chromatography. Not sure what Blackstone uses, but it seems to understate fuel contamination.No, the oil level isn't rising, there is nothing to indicate any type of fuel dilution. Evey sample I've taken has had >.5 dilution.
What is GC? Is that the other test that Phillips is talking about?
And flash point measurement has notoriously poor repeatability and reproducibility to start with. Extrapolating something from that measurement is only asking for trouble despite being an actual ASTM procedure. Not all ASTM tests are inherently accurate and they tell you that in the text.Blackstone uses ICP. However, the fuel concentration is not tested with spectral analysis; BS uses a fuel cup and estimates the value based on FP as I recall. However, it's been about a decade since I've visited their lab so things may have changed.
As noted Blackstone has a history of not being able to accurately measure things, especially flash point.I would say because your flashpoint still is pretty good it’s not fuel, but shear going on, and you need something with better shear stability. The viscosity isnt terrible if it truly has 16,000 miles on the oil.
Those we're either samples for new engine intervals, or other issues and the last prior to this was a draw from the dipstick tube. I've had a good bit of oil issues with this engine since new. I'm starting to think I need a heavier oil, or an additive. Something needs to stop this shearing.I was going off your previous samples of 3-5K miles compared to the one with 16K